{"id":8234,"date":"2023-11-28T20:19:46","date_gmt":"2023-11-28T12:19:46","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=8234"},"modified":"2023-12-02T21:57:22","modified_gmt":"2023-12-02T13:57:22","slug":"vue-zhong-fen-bie-jian-shucomputed-hewatch-de-shi","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/vue-zhong-fen-bie-jian-shucomputed-hewatch-de-shi\/","title":{"rendered":"Vue \u4e2d\u5206\u522b\u7b80\u8ff0 computed \u548c watch \u7684\u4f7f\u7528\u573a\u666f\uff1f"},"content":{"rendered":"<p><code>computed<\/code> \u548c <code>watch<\/code> \u90fd\u662f Vue \u4e2d\u7528\u4e8e\u76d1\u542c\u6570\u636e\u53d8\u5316\u7684\u529f\u80fd\uff0c\u5b83\u4eec\u7684\u4f7f\u7528\u573a\u666f\u7565\u6709\u4e0d\u540c\uff1a<\/p>\n<h3><a id=\"computed%E7%9A%84%E4%BD%BF%E7%94%A8%E5%9C%BA%E6%99%AF%EF%BC%9A\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a><code>computed<\/code> \u7684\u4f7f\u7528\u573a\u666f\uff1a<\/h3>\n<ul>\n<li><strong>\u6d3e\u751f\u6570\u636e\uff1a<\/strong> \u5f53\u9700\u8981\u6839\u636e\u5df2\u6709\u7684\u6570\u636e\u8ba1\u7b97\u51fa\u65b0\u7684\u6570\u636e\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>computed<\/code>\u3002\u5b83\u53ef\u4ee5\u57fa\u4e8e\u5df2\u6709\u7684\u54cd\u5e94\u5f0f\u6570\u636e\u8fdb\u884c\u8ba1\u7b97\uff0c\u5e76\u4e14\u53ea\u6709\u76f8\u5173\u4f9d\u8d56\u53d1\u751f\u53d8\u5316\u65f6\u624d\u4f1a\u91cd\u65b0\u8ba1\u7b97\uff0c\u5177\u6709\u7f13\u5b58\u7279\u6027\u3002<\/li>\n<li><strong>\u7b80\u5316\u6a21\u677f\u903b\u8f91\uff1a<\/strong> \u7528\u4e8e\u5904\u7406\u4e00\u4e9b\u590d\u6742\u903b\u8f91\u6216\u8ba1\u7b97\u5c5e\u6027\uff0c\u53ef\u4ee5\u76f4\u63a5\u5728\u6a21\u677f\u4e2d\u4f7f\u7528\uff0c\u800c\u65e0\u9700\u5728\u6a21\u677f\u4e2d\u4e66\u5199\u590d\u6742\u7684\u8ba1\u7b97\u903b\u8f91\u3002<\/li>\n<\/ul>\n<pre><code class=\"language-javascript\">\/\/ \u793a\u4f8b\uff1a\u8ba1\u7b97\u5546\u54c1\u603b\u4ef7\ncomputed: {\n  totalPrice() {\n    return this.items.reduce((total, item) =&gt; total + item.price * item.quantity, 0);\n  }\n}\n<\/code><\/pre>\n<h3><a id=\"watch%E7%9A%84%E4%BD%BF%E7%94%A8%E5%9C%BA%E6%99%AF%EF%BC%9A\" class=\"anchor\" aria-hidden=\"true\"><span class=\"octicon octicon-link\"><\/span><\/a><code>watch<\/code> \u7684\u4f7f\u7528\u573a\u666f\uff1a<\/h3>\n<ul>\n<li><strong>\u76d1\u542c\u7279\u5b9a\u6570\u636e\u53d8\u5316\uff1a<\/strong> \u5f53\u9700\u8981\u76d1\u542c\u67d0\u4e2a\u6570\u636e\u7684\u53d8\u5316\uff0c\u5e76\u5728\u6570\u636e\u53d8\u5316\u65f6\u6267\u884c\u4e00\u4e9b\u5f02\u6b65\u6216\u590d\u6742\u64cd\u4f5c\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>watch<\/code>\u3002<\/li>\n<li><strong>\u5bf9\u4e00\u4e9b\u6570\u636e\u53d8\u5316\u505a\u51fa\u54cd\u5e94\uff1a<\/strong> \u6bd4\u5982\u9700\u8981\u5728\u7279\u5b9a\u6570\u636e\u53d8\u5316\u65f6\u6267\u884c\u4e00\u4e9b\u64cd\u4f5c\uff0c\u6bd4\u5982\u53d1\u9001\u8bf7\u6c42\u3001\u6267\u884c\u52a8\u753b\u7b49\u3002<\/li>\n<\/ul>\n<pre><code class=\"language-javascript\">\/\/ \u793a\u4f8b\uff1a\u76d1\u542c\u6570\u636e\u53d8\u5316\uff0c\u5f53 message \u6539\u53d8\u65f6\u6267\u884c\u64cd\u4f5c\nwatch: {\n  message(newValue, oldValue) {\n    \/\/ \u6267\u884c\u76f8\u5e94\u64cd\u4f5c\uff0c\u6bd4\u5982\u53d1\u9001\u8bf7\u6c42\u7b49\n  }\n}\n<\/code><\/pre>\n<p>\u603b\u4f53\u800c\u8a00\uff0c<code>computed<\/code> \u9002\u5408\u7528\u4e8e\u8ba1\u7b97\u6216\u6d3e\u751f\u6570\u636e\uff0c\u5e76\u4e14\u5b83\u5177\u6709\u7f13\u5b58\u7279\u6027\uff1b\u800c <code>watch<\/code> \u66f4\u9002\u5408\u7528\u4e8e\u5bf9\u6570\u636e\u7684\u53d8\u5316\u505a\u51fa\u54cd\u5e94\uff0c\u6267\u884c\u4e00\u4e9b\u7279\u5b9a\u7684\u64cd\u4f5c\u3002\u9009\u62e9\u4f7f\u7528\u54ea\u79cd\u65b9\u5f0f\u53d6\u51b3\u4e8e\u4f60\u7684\u5177\u4f53\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>computed \u548c watch \u90fd\u662f Vue \u4e2d\u7528\u4e8e\u76d1\u542c\u6570\u636e\u53d8\u5316\u7684\u529f\u80fd\uff0c\u5b83\u4eec\u7684\u4f7f\u7528\u573a\u666f\u7565\u6709\u4e0d\u540c\uff1a compu [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[114],"tags":[],"class_list":["post-8234","post","type-post","status-publish","format-standard","hentry","category-vue"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/8234","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=8234"}],"version-history":[{"count":2,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/8234\/revisions"}],"predecessor-version":[{"id":14060,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/8234\/revisions\/14060"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=8234"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=8234"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=8234"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}